LuciferYang commented on pull request #29836:
URL: https://github.com/apache/spark/pull/29836#issuecomment-696655890
The error stack without this pr as follow:
```
Expected exception java.io.NotSerializableException to be thrown, but
java.lang.StackOverflowError was thrown
ScalaTestFailureLocation: org.apache.spark.streaming.StreamingContextSuite
at (StreamingContextSuite.scala:159)
org.scalatest.exceptions.TestFailedException: Expected exception
java.io.NotSerializableException to be thrown, but java.lang.StackOverflowError
was thrown
at
org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:472)
at
org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:471)
at
org.scalatest.funsuite.AnyFunSuite.newAssertionFailedException(AnyFunSuite.scala:1562)
at org.scalatest.Assertions.intercept(Assertions.scala:756)
at org.scalatest.Assertions.intercept$(Assertions.scala:746)
at org.scalatest.funsuite.AnyFunSuite.intercept(AnyFunSuite.scala:1562)
at
org.apache.spark.streaming.StreamingContextSuite.$anonfun$new$13(StreamingContextSuite.scala:159)
...
Caused by: java.lang.StackOverflowError
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1397)
at
org.apache.spark.streaming.dstream.DStream.writeObject(DStream.scala:513)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1140)
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at
scala.collection.generic.DefaultSerializationProxy.$anonfun$writeObject$1(DefaultSerializationProxy.scala:38)
at
scala.collection.generic.DefaultSerializationProxy.$anonfun$writeObject$1$adapted(DefaultSerializationProxy.scala:37)
at scala.collection.IterableOnceOps.foreach(IterableOnce.scala:553)
at scala.collection.IterableOnceOps.foreach$(IterableOnce.scala:551)
at scala.collection.AbstractIterable.foreach(Iterable.scala:920)
at
scala.collection.generic.DefaultSerializationProxy.writeObject(DefaultSerializationProxy.scala:37)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1140)
at
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visitSerializableWithWriteObjectMethod(SerializationDebugger.scala:230)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visitSerializable(SerializationDebugger.scala:189)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visit(SerializationDebugger.scala:108)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visitSerializableWithWriteObjectMethod(SerializationDebugger.scala:243)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visitSerializable(SerializationDebugger.scala:189)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visit(SerializationDebugger.scala:108)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visitSerializableWithWriteObjectMethod(SerializationDebugger.scala:243)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visitSerializable(SerializationDebugger.scala:189)
at
org.apache.spark.serializer.SerializationDebugger$SerializationDebugger.visit(SerializationDebugger.scala:108)
```
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